INFO: task syz-executor.1:30083 blocked for more than 143 seconds. Not tainted 5.0.0+ #13 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28376 30083 7587 0xa0020002 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 vhost_net_stop_vq+0x2d/0x120 drivers/vhost/net.c:1360 vhost_net_stop drivers/vhost/net.c:1374 [inline] vhost_net_release+0x5d/0x260 drivers/vhost/net.c:1406 __fput+0x2df/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 kobject: 'loop1' (0000000044339b02): kobject_uevent_env kobject: 'loop1' (0000000044339b02): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (0000000089c88356): kobject_uevent_env do_group_exit+0x135/0x370 kernel/exit.c:980 __do_sys_exit_group kernel/exit.c:991 [inline] __se_sys_exit_group kernel/exit.c:989 [inline] __ia32_sys_exit_group+0x44/0x50 kernel/exit.c:989 kobject: 'loop2' (0000000089c88356): fill_kobj_path: path = '/devices/virtual/block/loop2' do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 kobject: 'loop5' (000000005214a6d0): kobject_uevent_env RIP: 0023:0xf7fbd869 Code: Bad RIP value. kobject: 'loop5' (000000005214a6d0): fill_kobj_path: path = '/devices/virtual/block/loop5' RSP: 002b:000000000845fb7c EFLAGS: 00000202 ORIG_RAX: 00000000000000fc RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000845fbdc RDX: 0000000000000001 RSI: 000000000814afd8 RDI: 00000000080a81d2 kobject: 'loop3' (0000000006678a89): kobject_uevent_env RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 kobject: 'loop3' (0000000006678a89): fill_kobj_path: path = '/devices/virtual/block/loop3' R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 kobject: 'loop4' (00000000ee327e54): kobject_uevent_env Showing all locks held in the system: kobject: 'loop4' (00000000ee327e54): fill_kobj_path: path = '/devices/virtual/block/loop4' 1 lock held by khungtaskd/1041: #0: 0000000090afe088 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5052 kobject: 'loop5' (000000005214a6d0): kobject_uevent_env 3 locks held by udevd/3872: net_ratelimit: 24 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 kobject: 'loop5' (000000005214a6d0): fill_kobj_path: path = '/devices/virtual/block/loop5' protocol 88fb is buggy, dev hsr_slave_1 1 lock held by rsyslogd/7435: #0: 0000000061a3fad7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:796 2 locks held by getty/7547: #0: 00000000d1f629fb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000015a5672f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 kobject: 'loop3' (0000000006678a89): kobject_uevent_env 2 locks held by getty/7548: kobject: 'loop3' (0000000006678a89): fill_kobj_path: path = '/devices/virtual/block/loop3' #0: 0000000049cd0472 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000afe909a4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7549: #0: 00000000e2b5ce5e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000079cb3399 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7550: #0: 00000000927728f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000003f932e8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7551: #0: 000000002b1cce40 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000039676d26 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7552: #0: 00000000ac907d74 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000061574682 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/7553: #0: 000000006dd21115 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ec699e70 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/30083: #0: 000000003ac36201 (&vq->mutex){+.+.}, at: vhost_net_stop_vq+0x2d/0x120 drivers/vhost/net.c:1360 1 lock held by vhost-30089/30095: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1041 Comm: khungtaskd Not tainted 5.0.0+ #13 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:288 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 30095 Comm: vhost-30089 Not tainted 5.0.0+ #13 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:iotlb_access_ok+0x193/0x540 drivers/vhost/vhost.c:1222 Code: 48 c1 e8 03 4c 01 f8 48 89 45 98 48 8d 41 08 48 89 85 78 ff ff ff 48 c1 e8 03 48 89 45 90 e8 24 37 30 fc 48 8b 45 98 80 38 00 <0f> 85 2c 03 00 00 48 8b 45 b0 48 8b 18 48 85 db 0f 84 99 01 00 00 RSP: 0018:ffff888060417aa8 EFLAGS: 00000246 RAX: ffffed1015066000 RBX: 0000000000000000 RCX: ffffffff85402171 RDX: 0000000000000000 RSI: ffffffff85401edc RDI: 0000000000000006 RBP: ffff888060417b30 R08: ffff88809b0a46c0 R09: ffffed100d1686f7 R10: ffff888060417b68 R11: ffff888068b437b7 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000010 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000845d6a0 CR3: 000000009b429000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vq_iotlb_prefetch+0x114/0x230 drivers/vhost/vhost.c:1255 handle_rx+0x149/0x1900 drivers/vhost/net.c:1143 handle_rx_net+0x19/0x20 drivers/vhost/net.c:1285 vhost_worker+0x2a2/0x4a0 drivers/vhost/vhost.c:362 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352